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reference: add a description of max-index-length #2748

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merged 5 commits into from
Apr 15, 2020
Merged

reference: add a description of max-index-length #2748

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6b30bf5
reference: add max-index-length
zimulala Apr 14, 2020
172250f
*: add comments
zimulala Apr 15, 2020
08bf0ad
reference/configuration/tidb-server: address comments
zimulala Apr 15, 2020
de6fff6
reference/configuration/tidb-server: tiny update
zimulala Apr 15, 2020
a0c2a28
Merge branch 'master' into max-index-length
zimulala Apr 15, 2020
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19 changes: 13 additions & 6 deletions reference/configuration/tidb-server/configuration-file.md
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Expand Up @@ -111,6 +111,19 @@ TiDB 配置文件比命令行参数支持更多的选项。你可以在 [config/
+ 默认值：[]
+ 默认情况下，该 list 名单为空，表示没有所需修复的坏表信息。

### `max-server-connections`

+ TiDB 中同时允许的最大客户端连接数，用于资源控制。
+ 默认值：0
+ 默认情况下，TiDB 不限制客户端连接数。当本配置项的值大于 `0` 且客户端连接数到达此值时，TiDB 服务端将会拒绝新的客户端连接。

### `max-index-length`

+ 用于设置新建索引的长度限制。
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should put the difference with MySQL's link here?

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+1, we can add a little more explainations here.

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MySQL does not have this item.

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@bb7133 @AilinKid PTAL

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nice work

+ 默认值：3072
+ 单位：byte。
+ 目前的合法值范围 `[3072, 3072*4]`。MySQL 和 TiDB v3.0.11 之前版本（不包含 v3.0.11）没有此配置项，不过都对新建索引的长度做了限制。MySQL 对此的长度限制为 `3072`，TiDB 在 v3.0.7 以及之前版本该值为 `3072*4`，在 v3.0.7 之后版本（包含 v3.0.8、v3.0.9 和 v3.0.10）的该值为 `3072`。为了与 MySQL 和 TiDB 之前版本的兼容，添加了此配置项。

## log

日志相关的配置项。
Expand Down Expand Up @@ -160,12 +173,6 @@ TiDB 配置文件比命令行参数支持更多的选项。你可以在 [config/
+ 默认值：4096
+ 当语句的长度大于 `query-log-max-len`，将会被截断输出。

### `max-server-connections`

+ TiDB 中同时允许的最大客户端连接数，用于资源控制。
+ 默认值：0
+ 默认情况下，TiDB 不限制客户端连接数。当本配置项的值大于 `0` 且客户端连接数到达此值时，TiDB 服务端将会拒绝新的客户端连接。

## log.file

日志文件相关的配置项。
Expand Down